Fig. 1. Diagram of output power of lens with different parameters

Fig. 2. Relationship between waist spot ω₁ of image side and focal length f of lens 像方腰斑 与透镜焦距f的关系

Fig. 3. Relationship between numerical aperture R_NA and spot radius ω₁ of image side laser 像方激光数值孔径 与光斑半径 的关系

Fig. 4. Coupling efficiency of different coupling lenses

Fig. 5. Light path diagram of single lens coupling experiment

Fig. 6. Spot of laser output end

Fig. 7. Spot image of optical fiber end

Fig. 8. Variation of output power and coupling efficiency with input power